I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
It was up to the police whether to file criminal charges, and if they did not there is nothing you can do about that. You can sue the people who participated in hiding her for Interference with Parental Rights and seek money damages to punish them for their behavior.
As for the medical bills, you have no way to force them to pay her medical bills---or even the presumed father at this point in time because the legal father is unknown. You can sue the father for medical bills after the baby is born and paternity is determined through the court in a Paternity Action.
Under the law, the natural parents of a pregnant minor are responsible for the child's medical expenses, and while you can sue the father when the father is determined, only the father can be sued for the bills, and not the people who helped hide her.
You may reply back to me using the Reply link and I will be happy to continue to assist you until I am able to address your concerns, to your satisfaction.
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I wish you and yours the best in 2016,